load 0013.mat
u = toframes(1,:);
v = toframes(2,:);
tuv = cat(3,u,v);
[toframes, todescr, gss,ess]=flow_singular_pattern_detect(tuv,'norder',2,'lorder',-2);
figure( 'Color', 'w');     

subplot(4,3,1), imagesc(ess.octave{1}(:,:,1));
subplot(4,3,2), imagesc(ess.octave{1}(:,:,3));
subplot(4,3,3), imagesc(ess.octave{1}(:,:,6));

